The illumination l of an electric bulb is inversely proportional to the distance,d from the bulb, if the illumination is 10 units at a distance of 4m,find the formula connecting l and d and find the illumination,l when the distance is 20m

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.